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Precision machining technology
\"Introduces students, both at the secondary and postsecondary levels, to the exciting world of precision machining technology as it is practiced in the 21st century.\"
Book
Workspace analysis of an R (2-UPR/2-UPS) hybrid machine tool
This paper proposes a hybrid machine tool with an R (2-UPR/2-UPS) asymmetric layout. Its workspace is analyzed, that is, the set of accessible positions of the spindle tool head point under the condition that the motion range of each hinge is met. The workspace of the mechanism is an important component for analyzing the movement of the mechanism and an important indicator for evaluating the processing performance of the machine tool. An intuitive understanding of the workspace and analysis of the tool’s posture and position performance in the workspace are conducive to fully utilizing the processing capacity of the machine tool and improving the processing efficiency of the machine tool.
Journal Article
Traditional toolmaking : the classic treatise on lapping, threading, precision measurements, and general toolmaking
A reference for toolmaking skills and techniques, originally published in 1915.
Book
Dynamic analysis of cam-type automatic tool changer
The automatic tool changer (ATC), a core component of CNC machine tools, critically influences machining accuracy and productivity through its dynamic performance. To enhance ATC performance and guide drive system optimization, this study establishes a systematic dynamic model. We first derive the kinematic relationships between the input motion and the position, velocity, and acceleration of each moving component. Using the principle of virtual work, a dynamic model is then developed to relate the driving torque to the inertial loads of the mechanism. The model is validated through torque experiments and numerical examples, confirming its accuracy and revealing shortcomings in the current drive configuration.
Journal Article
Dynamic modeling and analysis of tool magazine reversing mechanism
Tool magazine is the core functional component of CNC machine tools to store and exchange tools. Its tool reversing mechanism is responsible for converting the tool to the tool change state or indexing state, which is a key part of tool magazine tool change. In order to complete the optimization of the driving and structural parameters of the inverted tool mechanism, this paper carries out the dynamic modeling and analysis of the inverted tool mechanism. Firstly, the vector method is used to establish the mapping relationship between the position, velocity, and acceleration of each moving member of the mechanism and the input; the principle of virtual work is used to establish the mapping model between the driving force and the motion of the mechanism; finally, combined with the arithmetic example, the influence laws of different input forces and scale parameters on the end motion of the mechanism are analyzed and obtained. The parameter optimization is carried out.
Journal Article
Machining for dummies
\"This hands-on guide begins with basic topics like tools, work holding, and ancillary equipment, then goes into drilling, milling, turning, and other necessary metalworking processes. You'll also learn about robotics and new developments in machining technology that are driving the future of manufacturing and the machining market\"--Amazon.com.
Book
Compilation of drilling load spectrum based on the characteristics of drilling force
In order to overcome the problem that the existing methods of compiling load spectrum of spindle or machine tool mainly aim at the cutting force spectrum, torque spectrum and speed spectrum, respectively, which ignore the connection between each spectrum, in this paper, a method for compiling drilling load spectrum of motorized spindle in CNC machine tool based on the characteristics of drilling force is proposed. Firstly, drilling tests under different processing technologies are carried out to measure its load, and the correction coefficient in the empirical formula of drilling force is obtained through fitting the measured drilling force, which makes the calculation of the axial force and torque more reasonable. Secondly, compared with the extended factor method, the transcendental probability method is optimized to solve the ultimate load of the axial force. Then, after setting the axial force as the main load of drilling, an eight-stage load spectrum for the main load is compiled. Finally, according to the relationship between the axial force and other loads, the eight-stage loading spectrum is transformed into a multidimensional drilling load spectrum.
Journal Article
Study of static thermal deformation modeling based on a hybrid CNN-LSTM model with spatiotemporal correlation
The thermal error of a machine tool is one of the main factors affecting the machining accuracy. By establishing the error model and compensating the error, the accuracy can be improved effectively. This paper presents a novel static thermal deformation modeling method based on a hybrid CNN-LSTM model with spatiotemporal correlation (ST-CLSTM). Firstly, by organizing the temperature data into a specific matrix, a sample set with spatiotemporal characteristics is constructed. Secondly, using convolutional neural network (CNN) to extract spatiotemporal features in the sample set, the problem of selecting temperature-sensitive points in thermal error modeling can be solved. Thirdly, the long short-term memory (LSTM) network is used to capture the characteristics of temperature change abstractly from the perspective of the time series of temperature data. Finally, the ST-CLSTM model is verified at different working conditions and compared with other traditional methods, such as the multiple linear regression (MLR) model, the back propagation neural network (BPNN) model, the CNN model, and the LSTM model. The experimental results show that the ST-CLSTM model obtains higher prediction accuracy in X, Y, and Z directions, which guarantees the stability of prediction performance. The proposed model possesses strong robustness and shows a preliminary industrial application prospect.
Journal Article